Karsyn is a a real-time host application for VSTi and DXi soft-synths as well as DirectX and VST audio effects designed for use in live performance.

Karsyn, a virtual instrument rack for software plug-ins based on technologies from brainspawn and co-developed by Open Labs, offers real-time control and flexibility. Karsyn features multiple simultaneous soft-synths, effects plug-ins, MIDI inputs, audio inputs and outputs. Karsyn supports up to 32 soft-synths with effects, as well as up to 32 WDM or ASIO outputs.

Advanced MIDI control allows the user to create keyboard splits and layers across multiple soft-synths in addition to the ability to independently remap MIDI present, channel and controller data for each soft-synth. Creation of multiple "scenes" allows the user to rapidly change MIDI and audio routing, synth patches and effects settings real-time in live performances.